Your own Google Home with Android Things on Raspberry Pi

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Build your own Google Home using Raspberry Pi and Android Things A powerful electronics platform running the familiar Android stack with full Java API support Arnav Gupta Co-Founder & Android Mentor @ Coding Blocks

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THE ANDROID FOR IOT ARCHITECTURE

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Familiar Android Stack

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Android Things High Level Overview

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WHAT BRILLO HAD PROMISED US ?

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What part is used from Android ?

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What part is used from Android ?

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HOW ANDROID THINGS FINALLY PANNED OUT

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The full Android Stack

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What is present on Android Things

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PREPARING FOR THE ANDROID THINGS ADVENTURE

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Requirement 1: The Board (any one) • Raspberry Pi 3 • NXP Pico MX6 • NXP Pico MX7 (Recommend this) • Intel Edison • … or crack open an old Android phone you’re not using :P

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Requirement 2: Lights and Buttons • 1xLED + 1xButton + Breadboard + Resistors • Or, get a Rainbow Hat

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Requirement 3: Audio (In & Out) • Speaker + Mic (if needed, use a 2 to 1 plug) • Protip: Search for “office conference room speakerphones”

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GET YOUR OPERATING SYSTEM

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Go to “Android Things Console” LOL ! Google SEO Fail :P

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Create a new product there

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Select your board

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Create new factory image

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Flash it • For NXP devices, fastboot flash (like you flash Nexus/Motorola devices) • For Raspberry, flash SD Card with Etcher

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WRITING ANDROID THINGS APPS

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Tell Gradle that this is Android Things

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Usually you’d want your app to be default and only app

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What not to use ?

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Supported Google APIs

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Unsupported Google APIs

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Wait a sec . . . Runtime permissions ? • Normal Permissions = At install time • Dangerous Permissions = After device reboot • No runtime dialog boxes (duh, no display)

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Cloud IOT Core = The Firebase for Android Things

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LET’S TAKE AN ELECTRONICS CLASS

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Basic Electronics supported • GPIO – Digital Inputs and Outputs • PWM – (Fake) Analog Inputs and Outputs • Serial Communication – I2C (Synchronous, Low Speed, 2-wire) – SPI (Synchronous, HighSpeed, multi-wire) – UART (Asynchronous, Only 1 peripheral)

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GPIO: Active High vs Active Low

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PWM: Analog using Digital

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BUTTONS AND LIGHTS

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The Button driver

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Using the Button

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Using the Button

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Lighting up LED via GPIO

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THE GOOGLE ASSISTANT API

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https://developers.google.com/assistant/sdk/reference/rpc/

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DEMO

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Links and Resources • https://github.com/androidthings • https://github.com/championswimmer/googl e_assistant_iot (This project I demoed) • My Slides: https://speakerdeck.com/championswimmer

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Weighing Pros and Cons of Android Things • We get > 50% of powerful Android Stack • Code sharing with Android applications • Easier to attach ad-hoc UI • Future: Easy delivery via Play Store • Google Backing (duh!) • Uses a lot of resources (vs Linux Kernel + C/Cpp bin) • Dodgy async and multi- threading (electronics are always sync) • Can make similar projects using JS libs in < 5% code • High code complexity trap

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@championswimmer [email protected]